CN102758722B - Wind turbine and wind turbine blade - Google Patents
Wind turbine and wind turbine blade Download PDFInfo
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- CN102758722B CN102758722B CN201210135816.6A CN201210135816A CN102758722B CN 102758722 B CN102758722 B CN 102758722B CN 201210135816 A CN201210135816 A CN 201210135816A CN 102758722 B CN102758722 B CN 102758722B
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- lobe fragment
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- fragment
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- 239000012634 fragment Substances 0.000 claims description 203
- 230000007704 transition Effects 0.000 claims description 23
- 230000003028 elevating effect Effects 0.000 claims description 18
- 229920003266 Leaf® Polymers 0.000 claims description 7
- 230000001965 increasing effect Effects 0.000 abstract description 7
- 241000143392 Oar Species 0.000 description 24
- 238000013461 design Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 244000287680 Garcinia dulcis Species 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
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- 239000010410 layer Substances 0.000 description 2
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- 238000013459 approach Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- 239000002344 surface layer Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0224—Adjusting blade pitch
- F03D7/0228—Adjusting blade pitch of the blade tips only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/0608—Rotors characterised by their aerodynamic shape
- F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
- F03D1/0641—Rotors characterised by their aerodynamic shape of the blades of the section profile of the blades, i.e. aerofoil profile
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0232—Adjusting aerodynamic properties of the blades with flaps or slats
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0256—Stall control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S415/00—Rotary kinetic fluid motors or pumps
- Y10S415/905—Natural fluid current motor
- Y10S415/908—Axial flow runner
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S415/00—Rotary kinetic fluid motors or pumps
- Y10S415/914—Device to control boundary layer
Abstract
A partial pitch wind turbine is described wherein the wind turbine blade (108) has an inner blade section (110a) designed for stall-controlled operation and an outer blade section (110b) designed for pitch-controlled operation. The different blade profiles for the different sections allow for the efficient operation of the blade while providing for the control of the wind turbine to effectively reduce blade root moments. The outer blade sections can be pitched out of the wind to reduce root moments due to the outer blade sections, while the increasing power capture of the inner blade section maintains nominal power output.
Description
Technical field
The present invention relates to a kind of wind turbine blade and relevant wind turbine, particularly a kind of part becomes oar wind turbine blade (partial-pitch wind turbine blade).
Background technique
In wind turbine running, because blade rotates under aerodynamic running, wind turbine blade root is bearing a large amount of load.This fatigue load produces sizable stress and strain in wind turbine structure, considers the intensity for the material of turbine structure, reinforcing etc., requires significantly design restriction.Therefore, meaningfully, research and develop the special wind turbine design that can reduce this load, for reducing the design restriction of whole turbine structure, prepare.
A special wind turbine structure is that a kind of part becomes oar wind turbine blade.Part becomes oar wind turbine and comprises a plurality of wind turbine blades with internal lobe fragment and siphonal lobe fragment.Siphonal lobe fragment can pitching with respect to internal lobe fragment, and the output power of wind turbine can be controlled, and with the wind speed to different, keeps rated output power.The embodiment that part becomes oar wind turbine comprises Denmark Nibe A wind turbine, and the MOD-2 wind turbine of American National aviation and space travel office (NASA) exploitation.
Similarly, in patent documentation, described and partly become blade sheet.These patent documentations comprise DE 91754US2009/0236857, and it discloses a kind of part and has become oar wind turbine, and this wind turbine has internal lobe fragment and the siphonal lobe fragment of relative to each other pitching.
For these parts, become oar wind turbine blade, generally, they have along blade continually varying aerodynamic profile, even when internal lobe fragment and siphonal lobe fragment maximum possible on time.
When outer segment not (consistent extreme span blade profile is provided) during pitching, part becomes blade sheet and presents single continuous blade profile, and under high wind behaviour, and siphonal lobe fragment can feathering, to reduce extreme loads.Yet part becomes blade sheet in normal operation, continues to stand a large amount of fatigue loads.
The object of the invention is, provide a kind of new part to become oar wind turbine blade and relevant wind turbine, it has further lowered the negative effect of wind load when operational efficiency is provided.
The object of the invention is, a kind of wind turbine blade is provided, this wind turbine blade, can more efficient running or control when the root moment reducing is provided.
Further object of the present invention is, meanwhile, and haply for the wind speed range of all rated power outputs, for internal lobe fragment provides the power yield of increase.
Summary of the invention
Therefore, provide the part of a kind of at least 35 meters long to become oar wind turbine blade, this blade comprises:
Internal lobe fragment;
Siphonal lobe fragment, it is connected in described internal lobe fragment in pitching connection bit, and described siphonal lobe fragment is with respect to the pitching of described internal lobe fragment, wherein,
Described internal lobe fragment comprises the first blade profile of the aerodynamics blade of controlling for stall, wherein, described siphonal lobe fragment comprises the second blade profile for the aerodynamics blade of elevating control, and wherein, described blade comprises discontinuous portion, and it is located at the described pitching connection bit place between described the first and second blade profiles.
Especially, provide the part of a kind of at least 35 meters long to become oar wind turbine blade, this blade comprises:
Internal lobe fragment;
Siphonal lobe fragment, it is connected in described internal lobe fragment in pitching connection bit, and described siphonal lobe fragment is with respect to the pitching of described internal lobe fragment, wherein,
Described internal lobe fragment comprises the first blade profile, the aerodynamics blade that this first blade profile is controlled for having the stall of the first aerodynamic profile, this first aerodynamic profile has the first maximum lift coefficient (CLmax1) and the first chord length (Ch1) in the end towards described pitching connection bit, and wherein
Described siphonal lobe fragment comprises the second blade profile, this second blade profile is for having the aerodynamics blade of the elevating control of the second aerodynamic profile, this second aerodynamic profile has the second maximum lift coefficient (CLmax2) and the second chord length (Ch2) in the end towards described pitching connection bit, and wherein
Described blade comprises discontinuous portion, and this discontinuous portion is located at the described pitching connection bit place between described the first and second blade profiles, and this discontinuous portion makes [(CLmax1) x (Ch1)] value at least than [(CLmax2) x (Ch2)], be worth large 20%.
Therefore, interior fragment is designed for stall and controls, and outer segment is designed for elevating control, and part becomes blade sheet and turns round optimum performance, the root load of simultaneous minimization blade are provided into part pitching.
Further find, the blade for the described aerodynamic profile with discontinuous portion, does not need complete transition region, therefore, a kind of blade is provided, and it more obviously has stall feature and pitching feature, and therefore allows sensitiveer and control more accurately.
Further, the discontinuity of [(CLmax) x (Chord)] value of two blade sections, a kind of blade structure is provided, this structure is suitable for using suitable controlling method, with under specified wind power output, pitching siphonal lobe fragment departs from wind, wherein, wind speed while producing rated power due to wind speed increase over blade, internal lobe fragment continues to produce the lift (also therefore increasing power yield) of increase.Be found that, the variation object of [(CLmax) x (Chord)] value is the stall that guarantees the inhibition internal lobe fragment grown as far as possible, with haply in the wind speed range of all rated power outputs, for internal lobe fragment provides the power yield of increase.
Because interior fragment is designed for stall, control, outer segment is designed for elevating control, and part becomes blade sheet and turns round optimum performance, the root load of simultaneous minimization blade are provided into part pitching.Because wind speed increases, siphonal lobe fragment can pitching depart from wind, and power production is transitioned into internal lobe fragment from siphonal lobe fragment.The power production increasing at internal lobe fragment place provides the blade reducing moment, causes root load to reduce, thereby causes the fatigue load in wind turbine structure to reduce.Between different blade profiles, the use of the discontinuous portion in connection bit place or jump portion, means and between blade sections, does not need complete transition region, and this transition region can affect the efficiency of whole blade.
Preferably, discontinuous portion is located at the connection bit place between the surface layer of blade sections.When the cross-sectional profile of the blade sections at pitching connection bit place is may be to a certain extent overlapping, they are not alignment accurately each other.Therefore,, when the longitudinal length along blade is observed from vane tip portion, can see discontinuous portion and the jump portion of blade surface.
The performance that is used for the blade profile of elevating control has obtained optimization within the scope of the little angle of attack, and this blade profile can have relatively large curvature, and the aerodynamics blade that stall is controlled, it is combined with relatively little curvature, there is comprehensive all round performance, and good lift-resistance ratios.The suitable aerodynamic profile of the blade sections of controlling for interior stall includes, but not limited to NACA-63-2XX blade profile.The suitable aerodynamic profile that is used for the blade sections of outer elevating control includes, but not limited to NACA-63-6XX blade profile.
Preferably, described internal lobe fragment is designed to enter stall than the larger angle of attack of described siphonal lobe fragment.
Because internal lobe fragment for example, enters stall at the angle of attack larger than siphonal lobe fragment (, at larger wind speed), therefore, the wind speed when blade place increases, and internal lobe fragment can the more power of proportional generation.This reduces the blade root moments of the part change blade sheet in running.
Preferably, described internal lobe fragment has the first aerodynamic profile, and this profile has the first maximum lift coefficient (CLmax1) and the first chord length (Ch1) at described pitching connection bit place.
Described siphonal lobe fragment has the second aerodynamic profile, this profile at described pitching connection bit place, there is the second maximum lift coefficient (CLmax2) and and the second chord length (Ch2), and wherein,
[(CLmax1) x (Ch1)] value is at least worth large 20% than [(CLmax2) x (Ch2)].
Because [(CLmax1) x (Ch1)] value is proportional with the power production of wind turbine blade, therefore the discontinuous portion that provides of blade sheet is provided for producing the part of power, this part becomes blade sheet and can effectively turn round, and the root moment of minimizing is provided simultaneously.Although, more effective, from siphonal lobe fragment, produce power (namely, due to its larger swept area), when wind speed increases the rated output power output that surpasses wind turbine, the significance of Leaf productivity reduces, and focus on guiding, reduces blade moment.Therefore, when wind speed increases, internal lobe fragment produces more power, makes blade root moments reduce (due to the distance reducing from root of blade).
Be understandable that, chord length can be measured in the inside and outside blade sections of pitching connection bit end separately.Another aspect of the present invention, chord length can be determined as the mean chord of a part of blade sections of contiguous pitching connection bit, for example, the mean chord of the partial blade section in 1 meter of pitching connection bit.Other parts at pitching connection bit place also can be for measuring mean chord, for example, apart from 5 meters of pitching connection bits, 10 meters etc.Preferably, the blade profile of described siphonal lobe fragment has the curvature larger than the blade profile of described internal lobe fragment.
Additionally or selectively, in described internal lobe fragment, at least one high-lift device is set, to suppress the stall of internal lobe fragment.
Internal lobe fragment can be by moulding, so that [(CLmax) x (Chord)] value larger than siphonal lobe fragment to be provided, and/or internal lobe fragment can comprise the lifting system of any appropriate setting, to improve the lift of internal lobe fragment, and postpone the stall of internal lobe fragment, make on-streamly, more power production is transferred to interior fragment.
Preferably, described at least one high-lift device can be selected from following one or more: vortex generator (vortex generator), gurney flap (Gurney Flap), flow spoiler, leading edge slat/slot (leading-edge slat/slot), boundary layer control device.
Preferably, wind turbine blade comprises that at least one is located at the stall fence at described pitching connection bit place.
The use of the stall fence at pitching connection bit place, makes elevating control and stall control air-flow in fragment from separated from one another, and blade movement is not hindered by the air-flow of any horizontal leap blade.
Preferably, the surface area of described internal lobe fragment roughly equates with the surface area of described siphonal lobe fragment.
Preferably, the longitudinal length of described internal lobe fragment approximates half of longitudinal length of described siphonal lobe fragment.
Also provide a kind of part to become oar wind turbine, comprising:
Wind turbine tower;
Be located at the cabin of described tower top; With
At least two parts that are located on the rotor hub that is positioned at place, described cabin as above become oar rotor blade,
Wherein, when siphonal lobe fragment does not become the internal lobe fragment pitching of oar rotor blade with respect to described part, described wind turbine is for producing rated output power at the first wind speed, and wherein, intra vane is designed to enter stall at the second wind speed larger than described the first wind speed.
Preferably, wind turbine further comprises control gear, to the wind speed higher than described the first wind speed, this control gear departs from wind for siphonal lobe fragment described in pitching, and the power capture of described internal lobe fragment increases between described the first wind speed and described the second wind speed.
When siphonal lobe fragment is departed from wind by pitching, the blade root moments relevant to the power production of siphonal lobe fragment can be reduced.Although, more effective, from siphonal lobe fragment, produce power (namely, due to its larger swept area), when wind speed increases the rated output power production that surpasses wind turbine, the significance of Leaf productivity reduces, and focus on guiding, reduces blade moment.Therefore, when wind speed increases, internal lobe fragment produces more power, makes blade root moments reduce (due to the distance reducing from root of blade).
Be understandable that, control gear can comprise the independently control module in the wind turbine structure that appears at wind turbine position, maybe can comprise the communication line that is connected to remote control center, be used to indicate the control gear of wind turbine, to the wind speed higher than described the first wind speed, reduce the power capture of described siphonal lobe fragment.
Preferably, described control gear departs from wind for siphonal lobe fragment described in pitching, and the wind speed with to higher than described the first wind speed, maintains rated output power.
Owing to increasing power capture or the production of internal lobe fragment, rated output power is maintained.
Additionally or selectively, provide part a kind of at least 35 meters long, that have root of blade and vane tip portion to become oar wind turbine blade, this blade comprises:
Be located at the internal lobe fragment of root of blade;
Be located at vane tip portion and in pitching connection bit, be attached to the siphonal lobe fragment of described internal lobe fragment, described siphonal lobe fragment is with respect to the pitching of described internal lobe fragment, wherein, longitudinal length from root of blade along blade, 2/3 of described internal lobe fragment far-end has mean chord C1,2/3 of the far-end of described siphonal lobe fragment has mean chord C2, and wherein, the length of C1 is more than or equal to the twice of C2 length.
Be understandable that, the aerodynamic profile of described internal lobe fragment can comprise level and smooth rear profile or the profile of blocking.
This use of blocking profile provides similar aerodynamic property, about lift etc., but conventionally causes noise level to increase.Yet, when internal lobe fragment (reduces owing to scanning distance) when relatively low speed turns round, for the noise level of this application, do not have too high.
When becoming the observation of oar root of blade from part, the fragment of namely blades adjacent pitching of the 2/3(connection bit of internal lobe fragment outside) there is the first mean chord, and namely, neighbouring part becomes the most advanced and sophisticated fragment of blade sheet to the outside 2/3(of siphonal lobe fragment) there is the second mean chord.The chord length of internal lobe fragment is at least the twice of outer leafs chord length.Therefore, compare with siphonal lobe fragment, internal lobe fragment has good lift-resistance ratios, and can produce more lift than other blade sections under higher wind, makes under higher wind, and internal lobe fragment produces more power pro rata.This set makes in turbine operation, and the blade root moments that wind turbine stands reduces.Be understandable that, the blade of this structure additionally or is selectively used in any other features described herein.
Additionally or selectively, blade can comprise at least one transition region, this transition region is located at the described pitching connection bit place between described the first and second blade profiles.
The use of transition region, makes the connection standardization between inside and outside blade sections, for example, is attached to appropriate pitch-controlled system.
On the one hand, described siphonal lobe fragment comprises outer tip and interior pitching end, and wherein, blade further comprises outer leafs transition region, and this outer leafs transition region is located between the interior pitching end and described pitching connection bit of described siphonal lobe fragment,
Wherein, blade comprises discontinuous portion, and this discontinuous portion is located at first blade profile at described pitching connection bit place and between second blade profile at the interior pitching end place of described siphonal lobe fragment.
Additionally or selectively, described internal lobe fragment comprises outer pitching end and interior root end, and wherein, blade is further included in the outer pitching end of described internal lobe fragment and the intra vane transition region between described pitching connection bit,
Wherein, blade comprises discontinuous portion, and this discontinuous portion is between first blade profile at outer pitching end place and second blade profile at pitching connection bit place of described internal lobe fragment.
Outer and/or interior transition region is preferably conical component, and its profile from the elevating control device of outer/inner blade sections transits to and is applicable to be attached to the profile that becomes the pitch-controlled system of oar wind turbine blade for part.Outer and/or interior transition region can be set to housing element, and it is bonded in a part of outer/inner blade sections, maybe can be set to the independent blade element between outer/inner blade sections and pitch-controlled system.
For these embodiments, when measuring chord length Ch1 and chord length Ch2, preferably, chord length is measured from the inside/outside blade sections of contiguous inside/outside transition region.
Preferably, the longitudinal length of outer transition region be about siphonal lobe fragment longitudinal length 20%.Preferably, the longitudinal length of interior transition region be about internal lobe fragment longitudinal length 20%.
Most preferably, provide the part of a kind of at least 35 meters long to become oar wind turbine blade, this blade comprises:
Internal lobe fragment;
In pitching connection bit, be connected in the siphonal lobe fragment of described internal lobe fragment, described siphonal lobe fragment is with respect to the pitching of described internal lobe fragment, wherein,
Described internal lobe fragment has the first aerodynamic profile, this first aerodynamic profile at described pitching connection bit place, there is the first maximum lift coefficient (CLmax1) and and the first chord length (Ch1), and,
Described siphonal lobe fragment has the second aerodynamic profile, this second aerodynamic profile at described pitching connection bit place, there is the second maximum lift coefficient (CLmax2) and and the second chord length (Ch2), and wherein,
[(CLmax1) x (Ch1)] value is at least worth large 20% than [(CLmax2) x (Ch2)].
Similarly, offer equally a kind of part and become oar wind turbine, comprising:
Wind turbine tower;
Be located at the cabin of described tower top; With
At least two parts of at least 35 meters long of being located on the rotor hub that is positioned at place, described cabin become oar rotor blades, and described rotor blade comprises is located at the internal lobe fragment of described rotor hub and with respect to the siphonal lobe fragment of described internal lobe fragment pitching,
Wherein, when described siphonal lobe fragment is during with respect to described not pitching of internal lobe fragment, described wind turbine is for producing rated output power at the first wind speed, and wherein, described internal lobe fragment is designed to enter stall at the second wind speed larger than described the first wind speed, and wherein, the pitching connection bit place that described siphonal lobe fragment becomes oar rotor blade in described part is attached to described internal lobe fragment, wherein
Described internal lobe fragment has the first aerodynamic profile, and this first aerodynamic profile has the first maximum lift coefficient (CLmax1) and the first chord length (Ch1) at described pitching connection bit place, and,
Described siphonal lobe fragment has the second aerodynamic profile, and this second aerodynamic profile has the second maximum lift coefficient (CLmax2) and the second chord length (Ch2) at described pitching connection bit place, and wherein,
[(CLmax1) x (Ch1)] value is at least worth large 20% than [(CLmax2) x (Ch2)].
Accompanying drawing explanation
Embodiment of the present invention will be described now, only by way of example, and with reference to corresponding accompanying drawing, wherein:
Fig. 1 comprises that according to of the present invention the part of rotor blade becomes the perspective view of oar wind turbine;
Fig. 2 is the planimetric map of part change oar rotor blade according to an aspect of the present invention;
Fig. 3 is the embodiment's of the blade profile controlled of stall sectional view;
Fig. 4 is embodiment's the sectional view of the blade profile of elevating control;
Fig. 5 becomes the perspective view of oar rotor blade according to the part of one aspect of the invention, the partial cross section of internal lobe fragment is shown; With
Fig. 6 is the sectional view of amplification of the blade of Fig. 5.
Embodiment
Referring to Fig. 1 and 2, according to wind turbine of the present invention, with 100, indicate generally.Wind turbine 100 comprises wind turbine tower 102, is located at the cabin 104 at described pylon 102 tops, is located at the rotor hub 106 at 104 places, described cabin.Described rotor hub 106 is provided with a pair of part and becomes oar rotor blade 108.
Referring to Fig. 2, rotor blade 108 comprises blade body, and this blade body has radicle 108a and the 108b of distal tip portion that is installed on described rotor hub 106.Rotor blade 108 comprises the internal lobe fragment 110a that is located at described radicle 108a, and is located at the siphonal lobe fragment 110b of described point 108b.Rotor blade 108 further comprises pitch-controlled system 112(pitch system), it is located at the connection bit between internal lobe fragment 110a and siphonal lobe fragment 110b.Pitch-controlled system 112 is for making siphonal lobe fragment 110b with respect to internal lobe fragment 110a pitching.
Internal lobe fragment 110a and siphonal lobe fragment 110b are designed to have different and distinguishing vane aerodynamic profile, blade sections can be turned round by different way, and have different capacity curvilinear characteristic.
In system of the present invention, internal lobe fragment 110a is designed to stall and controls blade, and siphonal lobe fragment 110b is designed to elevating control blade.This means that the design of internal lobe fragment 110a aerodynamically to turn round at the large-scale angle of attack, and when the wind speed at blade place becomes too high, is designed to enter stall.(turbulent fluctuation that stall control section produces will prevent that lift from acting on rotor).
Due to siphonal lobe fragment, 110b is designed to elevating control blade, and its aerodynamic design can be optimized for the running in the angle of attack among a small circle.This running can be controlled by appearing at the control module (not shown) of turbo machine position, or turbine operation can be passed through control centre's telecontrol.
Fig. 3 illustrates the embodiment of sample aerofoil profile, and with 10 indications, it is applicable to the blade profile that stall is controlled.This blade profile comprises leading edge 12, trailing edge 14, upper suction side 15 and downforce side 18.Stall is controlled blade and is had relatively small curvature (or tortuosity), and emphasis has been to provide level and smooth fault speed power curve.Stall is controlled blade and is had relatively high maximum lift coefficient (CLmax), and is designed in the wind ranges of relatively wide wind-force speed and the relevant angle of attack, with rational efficiency running.
The embodiment that blade profile is controlled in suitable stall includes, but not limited to NACA-63-2XX series blade profile.
Fig. 4 illustrates sample aerofoil profile embodiment, and with 20 indications, it is applicable in elevating control blade profile.This blade profile comprises leading edge 22, trailing edge 24, upper suction side 26 and downforce side 28.Elevating control blade has relatively large curvature (or tortuosity), and optimised, with high-efficiency operation within the scope of the little angle of attack.
The embodiment of the blade profile of suitable elevating control includes, but not limited to NACA-63-6XX series blade profile.
The power generation of blade sections proportional with the product of the chord length (Chord) of the maximum lift coefficient of blade sections (CLmax) and blade sections (string is the imaginary straight line of flexural center that is connected the leading edge of trailing edge and aerofoil section).Preferably, select the blade profile of inside and outside blade sections, make internal lobe fragment in the value of [(CLmax) x (Chord)] of pitching connection bit than the value at least large 20% of [(CLmax) x (Chord)] of siphonal lobe fragment.
The discontinuity of [(CLmax) x (Chord)] value of two blade sections provides a kind of blade structure, this blade structure is applicable to using suitable controlling method, under rated power output, pitching siphonal lobe fragment departs from wind, wherein, wind speed while producing rated power due to wind speed increase over blade, internal lobe fragment continues to produce the lift (also therefore increasing power yield) of increase.The variation object of [(CLmax) x (Chord)] value is the stall that guarantees to suppress as far as possible longways internal lobe fragment, with haply in the wind speed range of all rated power output, for internal lobe fragment provides the power yield of increase.
Be understandable that, chord length can be measured in the end of inside and outside blade sections pitching connection bit separately.In another approach, chord length can be determined as the mean chord of a part of blade sections of contiguous this pitching connection bit, for example, and the mean chord in the blade sections region in 1 meter of pitching connection bit, 5 meters, 10 meters etc.Additionally or selectively, at least one high-lift device is set in internal lobe fragment, to increase lift efficiency and to suppress the stall of internal lobe fragment.The embodiment of suitable high-lift device include but not limited to: vortex generator (vortex generator), gurney flap (Gurney Flap), flow spoiler, leading edge slat/slot, boundary layer control device.Further, wind turbine blade can comprise that at least one is located at the stall fence of pitching connection bit, to disturb any portraitlandscape of air to flow, and improves Blade Properties.
In the further reinforcement mode of blade, or in another alternative blade design, structure blade, makes the chord length value of internal lobe fragment larger than siphonal lobe fragment.In one embodiment, the exterior portion in the distally of internal lobe fragment comprises the first mean chord, and the exterior portion in the distally of siphonal lobe fragment comprises the second mean chord, and this first string is grown up in the second chord length.Preferably, the first mean chord is at least the twice of the second mean chord.In every kind of mode, the exterior portion in distally comprises the maximum blade sections length away from blade root end along blade longitudinal length.Preferably, the exterior portion in distally refers to 2/3 part of the outside of the blade sections of referring to, and for example, for the blade sections of 30 meters, refers to 20 meters of outside.This structure can be seen in Fig. 2, and wherein, the distally fragment of internal lobe fragment 110a comprises the string of a musical instrument of the distally fragment that is obviously greater than siphonal lobe fragment 110b.
Therefore, compare with siphonal lobe fragment, internal lobe fragment has higher total life, and therefore under higher wind speed, can produce more lift than other blade sections, makes the more power of the proportional generation of internal lobe fragment under higher wind.This set makes in turbine operation process, and the blade root moments that wind turbine stands reduces.
Due to inside and outside blade sections 110a, the profile shape of 110b is obviously different, needs to have coupling between blade sections, makes blade sections be attached to the pitch-controlled system 112 for blade 108.Be understandable that, pitch-controlled system 112 is round structure normally, but blade 108 comprises leading edge and trailing edge, can be included in the aerodynamic profile at pitch-controlled system 112 places.
Referring to the embodiment shown in Fig. 2, blade 108 can comprise transition region (with 113 indications), is located at the pitching connection bit end of siphonal lobe fragment 110b.The size of transition region 113, aerodynamic profile from the siphonal lobe fragment 110b of elevating control, for example, to the profile (, having than the profile in the wider cross section of siphonal lobe fragment 110b, to hold relatively wide pitch-controlled system 112) that is suitable for being attached to pitch-controlled system 112, diminish gradually.
In this embodiment, be understandable that, the discontinuity between aerodynamic profile can be checked through from being close to the end of the siphonal lobe fragment 110b of transition region 113, namely, and the cross section of the siphonal lobe fragment 110b at the boundary point A place illustrating on Fig. 2.
It will also be appreciated that, transition region can be additionally or is selectively located at the pitching connection bit end of internal lobe fragment 110a, and wherein, the internal lobe fragment 110a of blade 108 diminishes gradually, to be attached to relatively narrow pitch-controlled system, this pitch-controlled system is installed on the siphonal lobe fragment of elevating control.
Further selectively, be understandable that, blade can be provided with the first and second transition regions, separately for inside and outside blade sections.
Be understandable that, this transition region 113 is not that the present invention is moved to necessity, and inside and outside blade sections 110a, and the pitching connection bit end of 110b is applicable to being attached directly to pitch-controlled system 112, wherein, the discontinuity of the profile between blade sections is visible at pitch-controlled system 112 places.
Referring to Fig. 5, the part perspective cross-sectional view according to rotor blade 108 of the present invention is shown, from the trailing edge of radicle 108a towards leading edge and point 108b.From this view, be located at as seen the pitch-controlled system 112 rotor blade 108 body interior.Siphonal lobe fragment 110b comprises and scans profile, the point 108b of blade 108 is scanned backward, to improve vane aerodynamic performance.
Referring to Fig. 6, the viewgraph of cross-section of amplification of the connection bit of Fig. 5 is shown.In the embodiment of Fig. 6, between the end of internal lobe fragment 110a and the end of siphonal lobe fragment 110b, can see discontinuous portion or jump portion (with 114 indications), indicate the relative variation of the blade profile of each fragment.Be understandable that, also can use other distortion of blade profile, for example longer chord length, increases curvature etc.
Preferably, control rotor blade, make to produce at the first wind speed WS1 the wind turbine of rated output power, to the wind speed higher than WS1, start pitching siphonal lobe fragment and depart from wind, to reduce the power capture of siphonal lobe fragment, and to the wind speed higher than this first wind speed WS1, correspondingly reduce blade root moments.Part becomes the mix design of oar rotor blade, and wherein, siphonal lobe fragment is designed to elevating control, internal lobe fragment is designed to stall and controls, the running of guaranteeing internal lobe fragment increases power capture with wind speed, and is increased to WS1 when above when wind speed, can be used in and produces pro rata more power.
Because internal lobe fragment (setting of adjacent rotor wheel hub) produces more power, the arm of force that wind turbine structure stands subsequently reduces, and causes the load in wind turbine structure to reduce.Therefore, wind turbine structure design can be readjusted, and to tackle load and the fatigue of reduction, thereby causes engineering cost and require reducing.
Preferably, the surface area of internal lobe fragment is substantially equal to the surface area of siphonal lobe fragment, and the longitudinal length of internal lobe fragment approximates half of longitudinal length of siphonal lobe fragment.
The blade of prior art is attempted to control turbine operation by pitching siphonal lobe fragment, to provide constant output from these siphonal lobe fragments, yet in the present invention, the power capture increasing continuously from internal lobe fragment, make when wind speed increases, power production transits to internal lobe fragment from outer leafs, therefore, has reduced blade root moments.
When by the more power of the proportional generation of internal lobe fragment, because the arm of force is shorter, therefore, reduce blade moment.
Be suitable for using the controlling method of this blade to describe in unsettled Danish Patent Application No PA 2,011 70210, at this, this patent application be incorporated to by reference.
The application is not limited to embodiment described herein, and is not departing from the scope of the present invention interior modification applicable.
Claims (15)
1. the part of a kind at least 35 meters long becomes oar wind turbine blade (108), and this blade comprises:
Internal lobe fragment (110a);
In pitching connection bit, be connected in the siphonal lobe fragment (110b) of described internal lobe fragment (110a), described siphonal lobe fragment (110b) is with respect to described internal lobe fragment (110a) pitching, wherein,
Described internal lobe fragment (110a) comprises for having first blade profile (10) of the aerodynamics blade that the stall of the first aerodynamic profile controls, this first aerodynamic profile has the first maximum lift coefficient CLmax1 and the first chord length Ch1 in the end towards pitching connection bit (112), and wherein
Described siphonal lobe fragment (110b) comprises for having second blade profile (20) of aerodynamics blade of the elevating control of the second aerodynamic profile, this second aerodynamic profile has the second maximum lift coefficient CLmax2 and the second chord length Ch2 in the end towards described pitching connection bit (112), and wherein
Described blade (108) comprises discontinuous portion (114), the described pitching connection bit (112) of this discontinuous portion (114) between described the first blade profile (10) and the second blade profile (20) located, and this discontinuous portion (114) makes CLmax1x Ch1 value at least than CLmax2x Ch2, be worth large 20%.
2. part according to claim 1 becomes oar wind turbine blade (108), it is characterized in that: described internal lobe fragment (110a) is designed to enter stall than the larger angle of attack of described siphonal lobe fragment (110b).
3. part according to claim 1 and 2 becomes oar wind turbine blade (108), it is characterized in that: described internal lobe fragment (110a) has than the larger chord length of described siphonal lobe fragment (110b).
4. part according to claim 1 and 2 becomes oar wind turbine blade (108), it is characterized in that: in described blade sections end respect to one another, the profile of described siphonal lobe fragment (110b) has than the larger curvature of described internal lobe fragment (110a).
5. part according to claim 1 becomes oar wind turbine blade (108), it is characterized in that: in described internal lobe fragment (110a), at least one high-lift device is set, to suppress the stall of described internal lobe fragment (110a).
6. part according to claim 5 becomes oar wind turbine blade (108), it is characterized in that: described at least one high-lift device can be selected from following one or more: vortex generator, gurney flap, flow spoiler, leading edge slat/slot, boundary layer control device.
7. part according to claim 1 becomes oar wind turbine blade (108), it is characterized in that: described wind turbine blade comprises that at least one is located at the stall fence at described pitching connection bit place.
8. part according to claim 1 becomes oar wind turbine blade (108), it is characterized in that: the surface area of described internal lobe fragment (110a) roughly equates with the surface area of described siphonal lobe fragment (110b).
9. part according to claim 1 becomes oar wind turbine blade (108), it is characterized in that: the longitudinal length of described internal lobe fragment (110a) approximates half of longitudinal length of described siphonal lobe fragment (110b).
10. part according to claim 1 becomes oar wind turbine blade (108), it is characterized in that: the longitudinal length from root of blade along blade is measured, 2/3 of described internal lobe fragment (110a) far-end has mean chord C1,2/3 of the far-end of described siphonal lobe fragment (110b) has mean chord C2, wherein, the length of C1 is more than or equal to the twice of C2 length.
11. parts according to claim 1 become oar wind turbine blade (108), it is characterized in that: described blade can comprise at least one transition region (113), it is located at the described pitching connection bit place between described the first blade profile (10) and the second blade profile (20).
12. parts according to claim 11 become oar wind turbine blade (108), it is characterized in that: described siphonal lobe fragment (110b) comprises outer tip (108b) and interior pitching end, wherein, described blade further comprises is located at the interior pitching end of described siphonal lobe fragment (110b) and the outer leafs transition region (113) between described pitching connection bit, wherein
Described blade comprises discontinuous portion, and it is located at first blade profile at described pitching connection bit place and between second blade profile at the interior pitching end place of described siphonal lobe fragment (110b).
13. become oar wind turbine blade (108) according to the part described in claim 11 or 12, it is characterized in that: described internal lobe fragment (110a) comprises outer pitching end and interior root end, and wherein, described blade further comprises is located at the outer pitching end of described internal lobe fragment (110a) and the intra vane transition region (113) between described pitching connection bit
Wherein, described blade comprises discontinuous portion, and it is located between first blade profile at outer pitching end place and second blade profile at pitching connection bit place of described internal lobe fragment (110a).
14. 1 kinds of parts become oar wind turbine (100), comprising:
Wind turbine tower (102);
Be located at the cabin (104) at described pylon (102) top; With
At least two parts as claimed in claim 1, that be positioned on the rotor hub of locating in described cabin become oar wind turbine blade (108),
Wherein, when described siphonal lobe fragment (110b) does not become internal lobe fragment (110a) pitching of oar wind turbine blade (108) with respect to described part, described wind turbine (100) is for producing rated output power at the first wind speed, and wherein, described internal lobe fragment (110a) is designed to enter stall at the second wind speed larger than described the first wind speed.
15. parts as claimed in claim 14 become oar wind turbine (100), it is characterized in that: described wind turbine (100) further comprises control gear, to the wind speed higher than described the first wind speed, this control gear departs from wind for siphonal lobe fragment (110b) described in pitching, because the power capture of described internal lobe fragment (110a) increases between described the first wind speed and described the second wind speed, described control gear departs from wind for siphonal lobe fragment (110b) described in pitching, with the wind speed on described the first wind speed, maintains rated output power.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA201170209A DK177421B1 (en) | 2011-04-29 | 2011-04-29 | A Wind Turbine and Partial Pitch Wind Turbine Blade |
| DKPA201170209 | 2011-04-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102758722A CN102758722A (en) | 2012-10-31 |
| CN102758722B true CN102758722B (en) | 2014-09-17 |
Family
ID=46045885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210135816.6A Active CN102758722B (en) | 2011-04-29 | 2012-05-02 | Wind turbine and wind turbine blade |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8915714B2 (en) |
| EP (1) | EP2527645A2 (en) |
| CN (1) | CN102758722B (en) |
| CA (1) | CA2775557A1 (en) |
| DK (1) | DK177421B1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK177422B1 (en) * | 2011-05-06 | 2013-04-22 | Envision Energy Denmark Aps | A Wind Turbine and Associated Control Method |
| US10253751B2 (en) * | 2011-12-22 | 2019-04-09 | LM WP Patent Holdings A/S | Wind turbine blade assembled from inboard part and outboard part having different types of load carrying structures |
| CN103016276B (en) * | 2012-12-07 | 2015-01-21 | 清华大学 | Two-sectional inclined folding blade device for large wind-driven generator |
| DK177730B1 (en) * | 2013-01-15 | 2014-05-05 | Envision Energy Denmark Aps | Partial pitch wind turbine with floating foundation |
| CN103233855B (en) * | 2013-02-26 | 2015-10-07 | 北京三力新能科技有限公司 | Mixed-pitch technology of wind power impeller |
| US9353729B2 (en) | 2013-07-02 | 2016-05-31 | General Electric Company | Aerodynamic hub assembly for a wind turbine |
| US20170037832A1 (en) * | 2014-04-14 | 2017-02-09 | Envision Energy (Denmark) Aps | Wind Turbine with Floating Foundation and Position Regulating Control System and Method Thereof |
| CN104314761B (en) * | 2014-08-25 | 2017-02-22 | 丁健威 | Blade-foldable wind-power generator |
| DK178313B1 (en) * | 2014-12-09 | 2015-11-30 | Envision Energy Denmark Aps | Wind turbine blade with air leakage protection |
| BR102015024612A2 (en) * | 2015-09-24 | 2017-03-28 | Monteiro De Barros Marcelo | wind blade, tubular structure for wind blade, wind turbine and wind harness control method |
| WO2017193358A1 (en) * | 2016-05-13 | 2017-11-16 | 周方 | Multi-section rotor blade of wind turbine |
| CN106089570B (en) * | 2016-08-10 | 2023-03-10 | 西安交通大学 | Wind power blade with adjustable tail structure |
| WO2018079863A1 (en) * | 2016-10-24 | 2018-05-03 | 주식회사 와이이씨 | Blade pitch adjustment device for wind power generator |
| CN107035613A (en) * | 2017-05-23 | 2017-08-11 | 高文霞 | A kind of fluid vortex generator device for lifting wind power plant generated energy |
| US11473559B2 (en) * | 2018-09-13 | 2022-10-18 | Vestas Wind Systems A/S | Hinged wind turbine blade defining an angle in a flap-wise direction |
| CN110374794B (en) * | 2019-07-02 | 2024-03-29 | 中国大唐集团新能源科学技术研究院有限公司 | Passive independent variable blade |
| CN111608853B (en) * | 2020-07-01 | 2022-01-21 | 上海电气风电集团股份有限公司 | Fan blade |
| CN111950163B (en) * | 2020-08-20 | 2023-05-09 | 上海电气风电集团股份有限公司 | Wind blade fatigue life monitoring method |
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- 2012-04-27 EP EP12165910A patent/EP2527645A2/en not_active Withdrawn
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- 2012-05-02 CN CN201210135816.6A patent/CN102758722B/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| CA2775557A1 (en) | 2012-10-29 |
| US20120294723A1 (en) | 2012-11-22 |
| CN102758722A (en) | 2012-10-31 |
| DK177421B1 (en) | 2013-04-22 |
| EP2527645A2 (en) | 2012-11-28 |
| US8915714B2 (en) | 2014-12-23 |
| DK201170209A (en) | 2012-10-30 |
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